Let XXX have PDF f(x)=2xf(x) = 2xf(x)=2x for 0≤x≤10 \le x \le 10≤x≤1. What is the conditional expectation E[X∣X>0.5]E[X | X > 0.5]E[X∣X>0.5]?
0.75
0.777
0.8
0.666